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- W2005086300 abstract "The statistical properties of the output of a sparse array of independently suspended acoustic sensors submerged in the sea and exposed to vertically dispersed multipath signal arrivals typical of deep underwater propagation, are studied here. Horizontal components of element positions are subject to drift and defusion and are not accessible to manipulation; vertical components are assumed nontime varying once element depth has been set. Element positions are assumed known having been obtained using an independent measurement procedure not dealt with in this paper. The mean power pattern of such arrays in two dimensions with all elements at one depth and in three dimensions with different distributions of vertical positions, are obtained assuming conventional beamforming. Conventional focusing is found to be inefficient for signal energy collection and the output obtained is subject to variation typical of fading environments. To overcome these effects, multiple vertical beams are formed using the three-dimensional array, the beams looking at different angles to resolve the multipath rays. The multiple beams, constituting a collection of angle-of-arrival diversity branches are combined in customary ways. Beam separation to minimize noise correlation between branches is determined. Simulation results for such a system using various diversity combining techniques are presented and the improvements obtained are discussed." @default.
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- W2005086300 date "1983-02-01" @default.
- W2005086300 modified "2023-10-14" @default.
- W2005086300 title "Underwater acoustic sensor arrays using angle of arrival diversity to counteract fading in a multipath medium" @default.
- W2005086300 doi "https://doi.org/10.1121/1.388985" @default.
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